Nepal starts operating its largest hydropower station Kathmandu Post Kathmandu, July 6 -- The 456-megawatt Upper Tamakoshi Hydropower Project, Nepal's largest so far, reached a milestone on Monday with one of its six 76-megawatt units starting power generation. Once the project starts evacuating power from all its six units to the national grid, Nepal will earn a status of becoming a power surplus country during the wet season. Prime Minister KP Sharma Oli inaugurated the project located on the Tamakoshi River in Dolakha district in north-central Nepal, approximately 200km away from Kathmandu, by pressing a button during a video conference from Baluwatar.